I live for history lessons like this one:
Trying to destroy the country and its people would, in most people’s books, count as treason, I’d imagine. But then again, it’s a fairly tricky crime these days.
Until 1998, the penalty for treason was death. Under the Treason Act of 1351, anyone who "do violate the king’s companion, or the king’s eldest daughter unmarried, or the wife of the king’s eldest son" is committing treason. So James Hewitt and Will Carling, plus whoever else got lucky with her, should have been burned at the stake (the required punishment) for shagging Princess Di.
It gets better.